“For years, people have asked me, ‘What’s your dream role?’” Kristin Chenoweth says. “‘Is it “Hello, Dolly!”? Is it “Gypsy”?’ And I’ve always responded, ‘It hasn’t been written yet.’” She pauses for dramatic effect, then says, “Well, it has now.”

For Chenoweth, bringing the story of Jackie Siegel to Broadway with “ The Queen of Versailles ” — about the socialite who built America’s most over-the-top McMansion — is an opportunity to look beneath her character’s manicured facade.

“I’m not usually asked to dig this deep,” Chenoweth says from her dressing room at the St. James Theatre, which has been outfitted with cotton-candy-pink furnishings. “Jackie is complicated: Maybe she doesn’t make decisions that we would make, and maybe she spends her money in a way that we wouldn’t. But she als

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